Incandescent lamp.



J. WILSON.

INCANDESGENT LAMP.

APPLICATION FILED JUNE 4, 191( Patented J an. 16, 1912.

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' J. WILSON.

v INGANDESGENT LAMP. APPLICATION TILED mm 4, 1910.

1 014 686 Patented Jan. 16, 1912.

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UNITED STATES PATENT OFFICE. 3

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- Specification of Letters Patent.

- Patented Jan. 16,1912.

To all whom it may concern: I Be it known that I, JOHN WILSON, residingat Victoria, in the Province of BIItiSll Columbia and Dominion ofCanada, have invented certain new and useful Improvements inIncandescent Lamps, of which the following is a specification.

This .mvention relates to incandescent electric lamps, and moreparticularly to tortuous filament lamps, such as are usually made withtungsten or tantalum filaments, and has for its object to provide a lamphaving an interior reflector arranged to reflect the light raysemanating from the filament and thus magnify-the brilliancy of thelight.

Another and particular object is to provide a lamp of this character inwhich the reflecting element performs not only its function as areflector, but also acts as the insulating supporting stock for thefilaments.

Another object is to provide a structure in which the ends of theseveral lengths of the filament will be supported, without communicatingwith the reflecting material within the stock.

In the drawings forming a portion of this application, and in which likenumerals of re erence indicate similar parts ofthe several views,Figure1 is an elevational view of a lamp constructed in accordance with thepresent invention. Figure 2 is a transverse section on line 22 ofFig. 1. Fig. 3. is a longitudinal section on line 3-3 of Fig. 1. Fig. 4is a detailed perspective view of the stock and the filamentattachedthereto. Fig. 5is a detailed view of the su porting spider in elevation,removed from the stock. Fig. 6 is a view showing a modified form offilament and mountin therefor. Fig. 7 is a fragmentary sectiona view ofthe lower end of the stock.

Referring now to the drawings, there is shown an electric lamp includmgan attachin plug 5 to which there is attached the usual ulb 6. Withinthe bulb, there is a centrally located longitudinally extending hollowglass supporting stock which is poth lygonal in cross section and which,at its inner end, is connected with the inner extremities of the sidewalls of the bulb. This stock is transparent, and is interiorly coatedwith mercury or other reflecting material indicated at 8, the stockitself being indicated at 7, as shown. The reflecting metal terminatesshort of the inner end of the stock, as

illustrated, and formed in the outer surface of the stock, there are apair of circumscribing grooves 9..and 10 respectively, the

former being located adjacent to the outer end of the stock, while thelatter is located approximately at the inner end of the coating ofreflecting material. Engaged in each of these grooves, there isafilament supg s ider 11, consisting of a continuous piece of insulatedwire bent upon itself at spaced points to form radially projectingarms-12. The arms of one of these s iders are located each at the angle.formed y the union of two of the faces of the stock, while the arms ofthe opposite spider are located each midway between the edges of one ofthe faces of the stock, so that the arms of the two spiders are disposedin alternate relation. The connecting portions which extend between thearms 12 lie in the grooves 9 and 10, and the two portions A and B of thearms are twisted together as indicated at 14,110 hold the connectingportion, firmly in the slot.

Engaged tortuously with the outer ends of the arms there is a continuousfilament C which has its ends carried to the inner end of the stock,where they are attached to two outwardly extending feed wires 15 and 16,which are engaged through the side of the stock inwardly of the metallicreflecting coating. One of these wires 15 is carried to the surface ofthe attaching plug 5, while the other is carried through a centralcontact member 18, as indicated. It will thus be seen that a structureis produced in which the supporting stock performs the double functionof holding the two spiders in spaced relation, and of forming areflector within the inclosure of the filament.

reason of the fact that the arms of one B oi the spiders are located atthe angles of v the faces of the stock, and the arms'of the other eseveral lengths 17 of the filament ,0 do not extend across the angles ofthe faces of'thestock, but lie each opposite to one of e faces, so thata maximum of illuminat 1on is assured. By reason of the fact that thesupporting spiders are enga ed in grooves of the outer faces of the stocthere is no danger of contact between,these spiders and the -metallicreflecting coating within the stock, as. would be the case'were the1zpiders embedded in the glass of the stoc I I 7 wire Y passes centrallythrough the stock,

electriclamp;comprisingasupporting In the modified form of theinflention shown in Fig. 6, the stock. is provided with a Web X at itsouter end, through'wlii'ch there is passed a central feed wire Y,,form--ing one connection for the filament; which is married helically aroundthe .stock throughout the length thereof where"it' connected with theopposite feed wirei In thisform of the invention, the stock still rformsthe doublefunction of. holding the ament in proper position, whileacting as a reflecton By reason of the fact that the there is of courseno danger of its. contact with the metallic reflecting coating. Thehelical'filament is indicated atW. f l -What is claimed is:

' Witnesses 5 wound'on the arms, the disposition ofthe 25 'armsbeing'such that the various conv'oluti oils of the filament will lie acrossthe flat reflecting faces to secure a maximum amount of reflection fromthe said faces.

Intestimony whereof I aflix my signa- 'ture; innpresence of twowitnesses. v v

I i JOHN WILSON.

MAfUBICECA Nl DOUGLAS B. MCCORMAN.

lurality of flat re- 20.

